I just picked up a new 13" MBP for work and need to get another power supply for it. I'm being cheap and don't really want to pay $80 bucks for one from Apple. Anyway, does anyone know of a good website or place to get one cheaper? I tried amazon but even they were $80. Not looking for a knock-off version so thought I'd see if anyone here had a place they've used before and trust. Thanks!